Plastic composition



Patented May 27, 1930 UNITED STATES WOLF xnrronnvsxy Aim KARL a'sonum z,

PAT-END, OFFIC or onrchoo, rumors PLASTIC conrrosn'ioiv 1T0 Drawing.

as floor'putties and fillers are at present in use for filling holes and cracks and are used as a base for subsequent paint applications. However, the composition here disclosed presents a number of novel properties and characteristics that are of importance.

Not only will the composition adheie to various materials, but is moldable by hand pressure, can be applied conveniently and becomes very hard after drying. It can be nailed without cracking, sawed, filed, pol- 2 ished, colored and be-painted with oil and water colors and stains, and in general has the appearance and characteristics of .wood. It can be used not only for filling of cracks and crevices, but also for surfacing materials for ornamental decorations, in which case it ismolded to shape and after setting, it ,is glued or otherwise fixed to the surface. This composition consists of three essential types of ingredients The base of the componot. As a binder, we use what is commercially known as celluloid, which is composed of gun cotton and camphor'or some other plasticizer to prevent it from becoming brittle. Within the scope of binders for this particular composition also fall the various cel-, lulose esters, as nitro-cellulose, acetyl-celluose, and the cellulose ethers which in combination with a plasticizer, we have successfully substituted for celluloid. The third class of constituents is the use of various solvents. We have found that the type of solvents has a most important bearing upon the efliciency of the product. Some of the ordinary solvents used in connection with this composition have proved to be absolutely useless since they will not allow the adherence of the composition under ordinary working conditions.

\Ve have found that the best solvent to use in this connection is acetone.

50 parts to 50 parts.

we have found it advisable and prac- 65 sition is wood flour, or anyother fibrous prod- However, since 7 Application filed November 20, 1926. Serial No. 149,793.

acetone is so very volatile for ordinary usage, we have found that a' combination of about equal partsmf acetone, alcohol. and benzol gives the more suitable and desirable solvent for most cases. A variation oftthe solvents will give a composition of varying characteristics, and will find application in specific ini W stances. Besides the aforenamed solvents, We have found that we can'useothers as carbon tetrachloride, chloroform, and other halogenated'hydrocarbons. 'i

We have found that the most suitable and practicable ratio of liquid to solid is about For some particular instances, ticable to use a greater quantity of solvent, in other'instances,thereverse holds true? For this reason, we do not limit ourselves to a strict percentage ratio, of solvent to solid.

We have also found that the addition of small amounts of various chemicals wilLlend peculiar characteristics togthis composition and give it novel effects As instances, we cite the use of calcium oxide, lead oxide, or magnesium oxide, that will'lend an extreme I hardness to the composition. Casein, 1% to- 5% and linseed oil 1% to 5% will give a smooth surface that is exceedingly hard.

In the following, We give a general method for the preparation of this composition:

The necessary solvents are thoroughly mixed togetherand introduced into a closed mixing apparatus, together with a requisite amount of celluloid or cellulose esters. These are then mixed for a requisite timefor al- 1. 30 parts celluloid. parts solvent. 33 parts wood flour.

' V J F I 1,769,907

. 2. 15 parts Celluloid, r 45 parts solvent.

0.1part boiled linseed oil. '10 parts wood flour.

3. parts celluloid. I 45 parts solvent. C 2.5 parts talc.

' 10 parts wood flouro m I r 4. 10.parts celluloid.

45 parts solvent.

. 3 parts casein. I

I 0.5 part calcium. oxide. 1.5 partstalc. 10 parts wood flour.

5. 12 partscelluloid. I 40 parts solvent. 1 2o 10 parts magnesium oxide. I I 5 parts magnesium nitrate.

I 6.' 24 parts celluloid. 24 parts acetone; I r 25 24 parts alcohol.

7 24 parts benzol. I

24: parts wood flour. I I 4 parts-talc. ,7. 12 parts celluloid,

'. 1 2 partsacetone.

14pa'rts alcohol. 14 parts benzol. 12.66 parts wood flour. as I 1 g 2.00 parts casein. I .33-part calcium oxide.

' 1.00.:parttalc.

I Y 8. 20%} celluloid.

" i0 20% alcohol.*. I 20% acetone.

en z j 20% wood flour. I 1 7 4r It willbe obvious that theexactproportions I specified are not essential for satisfactory re- ,sults and. we do not wish to .be'limited except v as indicated in the appendedclaims. -We claim: I L A lasticmoldablecomposition of matl j ter consisting of approximately 20% each of celluloid, acetone,"alcohol,benzol and wood flour. I 2. A'pla stici'modable composition ofmat- .ter thatmay be worked by hand without mechanical pressure or apparatus consisting ot celluloid, acetone, the acetone being at least equal in; amount to the amount of celluloid 1 I used, alcohol, benzol, andwood'flour. Q I In testimony whereof we have 'aflixed' our signatures. V WOLF KRITCHEVSKY.

I a I LSCH'U LTZ. 

